Know Your Environment. Protect Your Health.

Chloromethane

Great Valley Town Water District #3 (bonne Val)

Chloromethane is an industrial solvent, aerosol propellant and a refrigerant. It also forms as a byproduct of water disinfection. The EPA classifies chloromethane as possibly carcinogenic to humans.

 

6

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.000 ppb111.000 ppb
20191.000 ppb111.000 ppb
20200.970 ppb110.970 ppb
20211.30 ppb111.30 ppb
20220.890 ppb110.890 ppb
20230.790 ppb110.790 ppb

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 2.69 ppb

The EWG Health Guideline of 2.69 ppb for chloromethane was defined by the Environmental Protection Agency as a benchmark for testing under the Unregulated Contaminant Monitoring Rule program. This health guideline protects against cancer.

ppb = parts per billion

All test results

Date Lab ID Result
2018-11-26EHS1800051958-01-POC1.000 ppb
2019-10-2830678130011.000 ppb
2020-12-1531485980010.970 ppb
2021-10-19EHS2100095360-POC1.30 ppb
2022-10-25R2210311-0010.890 ppb
2023-12-13R2311584-0010.790 ppb